Article
Geosciences, Multidisciplinary
P. A. Hall, D. M. McKirdy, G. P. Halverson, J. B. Jago, A. S. Collins
Summary: The study in the lower Cambrian marine sediments of the Stansbury Basin in South Australia utilized trace and rare earth element abundances, total organic carbon contents, and pyritic sulfur isotopic compositions to reveal the association between trace elements and organic matter, the relative depletion of heavy REEs and yttrium compared to light REEs, and the evolution of provenance from southerly derived sources. Additionally, it suggested that the prevailing paleoredox regime for the Heatherdale Shale and the Talisker Formation was dysoxic, with a gradual decline in delta S-34(py), while the Emu Bay Shale accumulated beneath an oxic water column. Similarities in trace element chemistry between the Paleo-Pacific and Asian oceans were also highlighted, as seen in comparisons with sequences on the Yangtze Platform in South China.
AUSTRALIAN JOURNAL OF EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Lei Wu, Wenting Huang, Huaying Liang, J. Brendan Murphy, Uwe Kirscher, Ross N. Mitchell, Louise M. A. Hawkins, Galen P. Halverson, Yu J. Gu, Jian Zhang, Xijun Liu
Summary: The Devonian position of the South China Block (SCB) is uncertain due to contradictory Devonian paleopoles. Two characteristic remanent magnetization components were found in the Guanyang Devonian successions, with one likely reflecting syn-depositional magnetization and the other associated with the Late Devonian Liujiang orogeny.
Article
Geosciences, Multidisciplinary
Graham A. Shields, Robin A. Strachan, Susannah M. Porter, Galen P. Halverson, Francis A. Macdonald, Kenneth A. Plumb, Carlos J. de Alvarenga, Dhiraj M. Banerjee, Andrey Bekker, Wouter Bleeker, Alexander Brasier, Partha P. Chakraborty, Alan S. Collins, Kent Condie, Kaushik Das, David A. D. Evans, Richard Ernst, Anthony E. Fallick, Hartwig Frimmel, Reinhardt Fuck, Paul F. Hoffman, Balz S. Kamber, Anton B. Kuznetsov, Ross N. Mitchell, Daniel G. Poire, Simon W. Poulton, Robert Riding, Mukund Sharma, Craig Storey, Eva Stueeken, Rosalie Tostevin, Elizabeth Turner, Shuhai Xiao, Shuanhong Zhang, Ying Zhou, Maoyan Zhu
Summary: This article reviews the processes that led to the current geological timescale and proposes revisions for subdividing time before 720 million years ago. The assessment of Precambrian rock records suggests that using rock-based concepts for subdivision may require only modest deviation from current chronometric boundaries.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2022)
Article
Geochemistry & Geophysics
D. H. Dang, W. Wang, T. M. Gibson, M. Kunzmann, M. B. Andersen, G. P. Halverson, R. D. Evans
Summary: The study reveals a gradual increase in U isotope values in late Proterozoic shales post Great Oxidation Event, indicating frequent transient oxygenation events and varied redox conditions. Late Proterozoic oceans were predominantly ferruginous with periods of transient oxygenation, leading to high U isotope fractionation during oxic conditions. Integration with other geochemical studies suggests localized oxygenation events across the globe during this period.
Article
Multidisciplinary Sciences
Changle Wang, Maxwell A. Lechte, Christopher T. Reinhard, Dan Asael, Devon B. Cole, Galen P. Halverson, Susannah M. Porter, Nir Galili, Itay Halevy, Robert H. Rainbird, Timothy W. Lyons, Noah J. Planaysky
Summary: Earth's surface has undergone a prolonged oxidation process, which has had a profound impact on the biosphere. Research shows that the oxygen levels in shallow marine environments were low in the Proterozoic era and gradually increased afterwards, coinciding with the rise of complex eukaryotic ecosystems.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Geosciences, Multidisciplinary
Galen P. Halverson, Chen Shen, Joshua H. F. L. Davies, Lei Wu
Summary: The application of high precision geochronology has greatly improved the age control and calibration of Proterozoic stratigraphic successions and events. However, there are still some poorly dated successions and time intervals. This study uses Bayesian inference and a thermal subsidence model to provide realistic ages and uncertainties for a Tonian composite section in Svalbard, which can be applied to calibrate other Tonian successions.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Lei Wu, J. Brendan Murphy, William J. Collins, John W. F. Waldron, Zheng-Xiang Li, Sergei A. Pisarevsky, Galen P. Halverson
Summary: This study investigates the migration of peripheral terranes between Gondwana and Laurentia-Baltica during the Paleozoic era and suggests that the development of the trans-Iapetus transform fault played a significant role in this process. The formation of this transform fault is attributed to the global geodynamic transition from the break-up of Rodinia to the amalgamation of Pangea.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geology
Alexie E. G. Millikin, Justin Strauss, Galen P. Halverson, Kristin D. Bergmann, Nicholas J. Tosca, Alan D. Rooney
Summary: The Tonian-Ediacaran Hecla Hoek succession in Svalbard, Norway, is an important record of the Neoproterozoic Earth system. New age constraints provide insight into the timing of glaciation in Svalbard and support the occurrence of two globally synchronous Cryogenian glaciations. These findings contribute to our understanding of pre- and post-snowball Earth weathering conditions.
Article
Multidisciplinary Sciences
Katie M. Maloney, James D. Schiffbauer, Galen P. Halverson, Shuhai Xiao, Marc Laflamme
Summary: The rise of eukaryotic macroalgae played a crucial role in Earth's history, leading to ecosystems habitable to animals. However, the diversification and expansion of macroalgae are limited by a biased fossil record. Non-mineralizing organisms are rarely preserved and occur only in exceptional environments conducive to fossilization.
SCIENTIFIC REPORTS
(2022)
Article
Geosciences, Multidisciplinary
M. Kunzmann, V Crombez, T. N. Blaikie, O. Catuneanu, R. King, G. P. Halverson, S. Schmid, S. C. Spinks
Summary: The ca 1640 Ma Barney Creek Formation in northern Australia is a highly prospective unit for clastic-dominated Zn-Pb deposits. An analysis of well data reveals significant geographical variations in the deposition center of the formation, indicating a structural reorganization of the basin.
AUSTRALIAN JOURNAL OF EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Chen Shen, Mark Schmitz, Peter Johnson, Joshua H. F. L. Davies, Galen P. Halverson
Summary: This study reports new high-precision U-Pb zircon ages from the Muraykhah Formation and analyzes the cyclical features of these rocks using astrochronology. The data provides a continuous, tuned record that offers new constraints on the geological events in the early Ediacaran period.
PRECAMBRIAN RESEARCH
(2022)
Article
Paleontology
Katie M. Maloney, Dakota P. Maverick, James D. Schiffbauer, Galen P. Halverson, Shuhai Xiao, Marc Laflamme
Summary: The preservation of Proterozoic eukaryotic macroalgae is challenging due to the lack of necessary morphological details. Two additional forms have unidentified affinities, but the presence of three unique algal forms supports previous reports of increased algal diversity in the early Neoproterozoic.
JOURNAL OF PALEONTOLOGY
(2023)
Article
Geosciences, Multidisciplinary
J. Wilder Greenman, Angelo dos Santos, Mollie Patzke, Timothy M. Gibson, Alessandro Ielpi, Galen P. Halverson
Summary: The Bylot basins in northeastern Canada and northwestern Greenland consist of the Borden, Aston-Hunting, Fury and Hecla, and Thule basins. These late Mesoproterozoic sedimentary basins have preserved a significant record of northeastern Laurentia during the emplacement of the Mackenzie large igneous province, the Shawinigan and Ottawan phases of the Grenville Orogeny, and the formation of the Midcontinent Rift. However, the lack of chronostratigraphic constraints has made it difficult to establish correlations between the sedimentary successions of the Bylot basins, leaving questions about their connectivity, tectonostratigraphic history, and relationship with regional tectonic events unanswered. Recent Re-Os geochronology has provided depositional ages for the Borden and Fury and Hecla basins, which, combined with existing models, allow for the identification of three tectonostratigraphic assemblages in the Bylot basins. The refined tectonostratigraphic framework can be applied to Greenland to propose a hypothesis for the position of the Thule Supergroup.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2023)
Article
Geochemistry & Geophysics
Tianran Zhang, C. Brenhin Keller, Mark J. Hoggard, Alan D. Rooney, Galen P. Halverson, Kristin D. Bergmann, James L. Crowley, Justin Strauss
Summary: Researchers have improved quantitative subsidence analysis techniques for post-rift thermally subsided basins by introducing uncertainties and using Monte Carlo and Markov chain Monte Carlo methods. They applied this technique to a sedimentary succession in northeastern Svalbard, Norway, and obtained age estimations consistent with previous studies.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Nagissa Mahmoudi, Andrew D. Steen, Galen P. Halverson, Kurt O. Konhauser
Summary: Heterotrophic microorganisms are crucial in the cycling of key elements in the ocean. They degrade organic matter produced by phytoplankton, redistributing nutrients and carbon in the water column. However, most organic matter is too large to be directly taken up by microorganisms, prompting the secretion of exoenzymes. This article explores the fate of organic matter in early oceans without exoenzymes and highlights their importance in unlocking previously inaccessible organic matter and transforming ocean geochemistry.
Article
Geosciences, Multidisciplinary
Bin Zhang, Jiaqi Liu, Wen Chen, Zhiliang Zhang, Li Yang, Lei Zhang, Zeyang Zhu, Chunqing Sun, Zhihao Sun
Summary: The eastern Tibetan Plateau is a region with unique topography and active tectonics, making it crucial for studying geodynamics and lithosphere-atmosphere interaction. By integrating new and reported thermochronological data, as well as paleo-crustal thickness reconstruction, this study sheds light on the tectonic deformation, climate-tectonic coupling, and geodynamics of the area.
Article
Geosciences, Multidisciplinary
Zhenhua Tian, Shangwen Zhou, Songtao Wu, Sai Xu, Junping Zhou, Jianchao Cai
Summary: This paper presents a modified method for calculating the lost gas content of shale by analyzing the coring and on-site desorption processes. The method accurately depicts the loss characteristics of free and adsorbed gas and identifies parameters that influence the calculation of in-situ shale gas content. The results demonstrate that the method shows satisfactory applicability in gas loss curve prediction and in-situ gas content estimation.
Article
Geosciences, Multidisciplinary
Pengcheng Li, Jaffar Abbas, Daniel Balsalobre-Lorente, Qingren Wang, Qianxiao Zhang, Syed Ale Raza Shah
Summary: This study explores the factors contributing to sustainability in Pakistan from 1974 to 2018 and finds that emissions from industrial and agriculture sectors have significantly decreased, while the financial sector has not effectively reduced environmental pressure. Therefore, Pakistan needs to adjust its economic policies and ensure the green allocation of financial resources.
Article
Geosciences, Multidisciplinary
Shi Zhou, Ting Zhou, Duo Guan, Yong Yao, Huimin Sun, Ahmed Ali Mosa, Yajie Zuo, Xianqiang Yin
Summary: Graphitic carbon nitride (g-C3N4) has been widely used due to its excellent optical properties and physicochemical stability. The risk of g-C3N4 transport in the environment has been overlooked, but this study investigated its transport behavior in various media. The results showed that flow rate and ionic strength influenced the transport, and the presence of lead (Pb) affected the outflow of g-C3N4. The unique structure of g-C3N4 particles allowed them to deposit in certain media and act as carriers for Pb release.
Article
Geosciences, Multidisciplinary
Xiaolong Qiao, Muntasir Murshed, Mohammad Mahtab Alam, Narasingha Das, Kurshid Khudoykulov, Salman Tariq
Summary: This study examines how macroeconomic factors influence India's carbon emission intensity levels and confirms the impact of factors such as foreign remittance receipts, energy consumption, urbanization, and technological progress. The findings provide policy recommendations for India's carbon emission reduction targets.
Article
Geosciences, Multidisciplinary
Wei Liu, Bo Wan
Summary: Magmatic-hydrothermal systems play a crucial role in transporting materials and potentially affecting Earth's long-term environment. This study investigates the duration of prograde metamorphism induced by fluid infiltration and the amount of carbon released by skarn ore deposits. The findings reveal that skarn ore deposits can efficiently decarbonize CO2 at a high rate, surpassing volcanism in different tectonic settings. The CO2 flux of skarn deposits increases over time and reaches a maximum value at the J/K boundary, providing an important previously unquantified source of outgassing in the subduction zone.
Article
Geosciences, Multidisciplinary
Haikuan Nie, Pei Li, Qing Chen, Zhijun Jin, Quanyou Liu, Wei Dang, Qian Chen, Jianghui Ding, Changbo Zhai
Summary: This study investigates the shale quality and shale gas potential in the upper Ordovician to lower Silurian formations in the Sichuan Basin of southern China. The distribution and characteristics of organic-rich shale are analyzed, aiding in the assessment of shale gas potential and identification of sweet spots.
Article
Geosciences, Multidisciplinary
Najia Saqib, Shujaat Abbas, Ilhan Ozturk, Muntasir Murshed, Malgorzata Tarczynska-Luniewska, Mohammad Mahtab Alam, Waldemar Tarczynski
Summary: This study examines the impact of economic growth, financial development, eco-friendly ICT, renewable energy, and human capital on lowering carbon footprint in the world's top polluting economies from 1993 to 2020. The findings suggest that eco-friendly ICT has the potential to effectively alleviate pollution, and financial development, renewable energy, and environmental technology are proposed as potential solutions for reducing carbon emissions.
Article
Geosciences, Multidisciplinary
Hikmat Salam, Syed Ali Turab, Asghar Ali, M. Qasim Jan, Norasiah Sulaiman, Mohd Basril Iswadi Basori
Summary: The Kahi melange complex in NW Pakistan is an important record of the tectonic evolution between the Indian plate and the Afghan block, consisting of highly dismembered ophiolitic and sedimentary units.
Article
Geosciences, Multidisciplinary
Er-Kun Xue, Wei Wang, David Chew, Manoj K. Pandit, Xin Deng, Yang Tian, Xi-Run Tong, Jun-Hong Zhao
Summary: The study reveals the presence of water-fluxed melting during the Wuyi-Yunkai Orogeny in South China. These water-fluxed melting quartzo-feldspathic migmatites formed during the early Paleozoic and were melted through reactions involving water-saturated quartz, feldspar, biotite, and K-feldspar. The findings highlight the significance of water-fluxed anatexis in the differentiation of the continental crust during orogenesis.
Article
Geosciences, Multidisciplinary
Hadi Shafaii Moghadam, Qiu-Li Li, William L. Griffin, Xian-Hua Li, Orhan Karsli, Christopher J. Spencer, Jose F. Santos, Maria Kirchenbaur, Sobhi Nasir, Suzanne Y. O'Reilly
Summary: Understanding the crustal growth, reworking, and geodynamics of the northern continental margin of Gondwana during the Ediacaran to Silurian times is crucial for the paleogeographic reconstruction of Gondwana. This study uses various analytical methods to evaluate the magmatic history of this region and obtain relevant detrital zircon data. The results provide valuable insights into the crustal evolution and tectonic activities in the northern Gondwana region.
Article
Geosciences, Multidisciplinary
Laura Petrescu, Felix Borleanu, Emanuel Kaestle, Randell Stephenson, Anica Placinta, Oleksandr Ivanovich Liashchuk
Summary: This study investigates the seismic structure of the Eastern European lithosphere and the transition from Precambrian to Phanerozoic Europe. The results show that the crust thickens across the Trans European Suture Zone boundary and the mantle is seismically faster beneath younger terranes. The Precambrian building blocks exhibit contrasting seismic fabrics, with the Baltic orogens characterized by uniform crust and the Sarmatia region showing alternating high and low velocity layers.
Article
Geosciences, Multidisciplinary
Dongya Zou, Hongfu Zhang
Summary: This study analyzes the U-Pb-Hf-O isotopes of zircons in felsic granulite xenoliths from the Fuxin late Cretaceous basalts in the North China Craton to evaluate the role of magma underplating in modifying the Archean lower crust. The results show that long-lived magma underplating occurred beneath the Fuxin region during the Mesozoic, with underplated magmas originating from the lithospheric mantle and later from the depleted asthenospheric mantle. This study concludes that magma underplating not only provided heat for remelting, but also added exotic material and weakened the lower crust, leading to its destruction.
Article
Geosciences, Multidisciplinary
Yu Han, Yingchang Cao, Chao Liang, Keyu Liu, Fang Hao
Summary: A paleoclimate reconstruction based on high-resolution records from lacustrine shale in the Bohai Bay Basin reveals a shift in orbital variability and a humidification event at -41.9 Ma in East Asia. The intensification of the East Asian monsoons at this time was likely a response to the elevated atmospheric pCO2 during the concurrent global warming.
Article
Geosciences, Multidisciplinary
Francesca Innocenzi, Sara Ronca, Stephen Foley, Samuele Agostini, Michele Lustrino
Summary: This study investigates two volcanic provinces in the western branch of the East African Rift and finds that the volcanic products show wide variability in chemical and mineralogical characteristics. Petrographic and geochemical analysis reveals enriched and heterogeneous sub-lithospheric mantle sources. The differences in isotopic features between the two volcanic provinces may indicate changes in the composition, mineralogy, and depth of melting in the lithospheric mantle source.
